In most homes, yes by a wide margin. A box fan uses relatively little electricity, while whole-home central air can draw several thousand watts when it is actively cooling.
Open the prefilled comparison below to see the monthly and yearly gap for an overnight cooling pattern, then adjust the runtime and rate for your own setup.
Example estimate
At that usage level, the yearly gap is about $1,726.20.
A fan does not lower the room temperature the way central air does, so the right choice depends on climate, humidity, and comfort needs. But if you only need light overnight airflow, the electricity cost difference is often dramatic.
If you are choosing between room cooling options, a second comparison can help show whether a portable AC or window AC is a better match for the room and budget.
Usually yes. A box fan often uses a small fraction of the electricity that central air uses while actively cooling.
Whole-home systems vary a lot, but a few thousand watts is a practical starting point if you do not have your exact system data.
Yes. The prefilled comparison opens inside WattWise and you can change wattage, daily hours, rate, or days per month immediately.